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I am indebted to Mr. P. W. James for help in the preparation of these notes, and to the British Museum (Natural History) and the Royal Botanic Gardens, Kew, for facilities to examine specimens in their herbaria. REFERENCES

Eighteen members attended, although not all were present at the same time. We were made most welcome by the Folkestone Natural History Society, and in addition we received an unsolicited favourable notice in a local newspaper (Anon., 1963). The Folkestone district is more humid than the rest of Kent, the mean annual rainfall being 29.1 in. (73.9 cm.) compared with about 25 in. (63.6 cm.) elsewhere, and the Meyer precipitation/saturation deficit quotient lies between 200 and 300 instead of below 200 as in the rest of the county (Perring and Walters, 1962). Measurements of atmospheric pollution are not available, but the degree of pollution, though not entirely negligible, can be assumed to be low. The comparative moistness and cleanness of the air accounts for the presence of some foliose lichens-Parmelia physodes, P. sulcata, P. glabratula-on street trees in the residential parts of the town, which is an unusual phenomenon in southeast England. Corticolous species were looked for in the following localities : Mersham-le-Hatch (nat. grid 61/0640). A group of common species occurred here which were found again repeatedly in other places-namely,

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ADDITIONAL NOTE.-During the reviewing of the V.C. records several specimens were seen of " apparent" Stereocaulon pileatum from S.E. England (V.C. 17), one specimen in actual fact being obtained from a wall of a London suburb and another on decorticate wood. In view of the general arctic-alpine affinities of S. pileatum and the apparent presence of Gleocapsa in the cephalodia instead of Stigonema, this material needs further investigation and will be the subject of a later communication. My thanks are due to the following for the loan of herbarium material: